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src/share/vm/services/memTracker.cpp

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  30 #include "services/memTracker.hpp"
  31 #include "utilities/defaultStream.hpp"
  32 
  33 #ifdef SOLARIS
  34   volatile bool NMT_stack_walkable = false;
  35 #else
  36   volatile bool NMT_stack_walkable = true;
  37 #endif
  38 
  39 volatile NMT_TrackingLevel MemTracker::_tracking_level = NMT_unknown;
  40 NMT_TrackingLevel MemTracker::_cmdline_tracking_level = NMT_unknown;
  41 
  42 MemBaseline MemTracker::_baseline;
  43 Mutex*      MemTracker::_query_lock = NULL;
  44 bool MemTracker::_is_nmt_env_valid = true;
  45 
  46 
  47 NMT_TrackingLevel MemTracker::init_tracking_level() {
  48   NMT_TrackingLevel level = NMT_off;
  49   char buf[64];
  50   char nmt_option[64];
  51   jio_snprintf(buf, sizeof(buf), "NMT_LEVEL_%d", os::current_process_id());
  52   if (os::getenv(buf, nmt_option, sizeof(nmt_option))) {

  53     if (strcmp(nmt_option, "summary") == 0) {
  54       level = NMT_summary;
  55     } else if (strcmp(nmt_option, "detail") == 0) {
  56       level = NMT_detail;
  57     } else if (strcmp(nmt_option, "off") != 0) {
  58       // The option value is invalid
  59       _is_nmt_env_valid = false;
  60     }
  61 
  62     // Remove the environment variable to avoid leaking to child processes
  63     os::unsetenv(buf);
  64   }
  65 
  66   // Construct NativeCallStack::EMPTY_STACK. It may get constructed twice,
  67   // but it is benign, the results are the same.
  68   ::new ((void*)&NativeCallStack::EMPTY_STACK) NativeCallStack(0, false);
  69 
  70   if (!MallocTracker::initialize(level) ||
  71       !VirtualMemoryTracker::initialize(level)) {
  72     level = NMT_off;


 294       _bucket_over_threshold ++;
 295     }
 296     _longest_bucket_length = MAX2(_longest_bucket_length, length);
 297   }
 298 };
 299 
 300 
 301 void MemTracker::tuning_statistics(outputStream* out) {
 302   // NMT statistics
 303   StatisticsWalker walker;
 304   MallocSiteTable::walk_malloc_site(&walker);
 305   walker.completed();
 306 
 307   out->print_cr("Native Memory Tracking Statistics:");
 308   out->print_cr("Malloc allocation site table size: %d", MallocSiteTable::hash_buckets());
 309   out->print_cr("             Tracking stack depth: %d", NMT_TrackingStackDepth);
 310   NOT_PRODUCT(out->print_cr("Peak concurrent access: %d", MallocSiteTable::access_peak_count());)
 311   out->print_cr(" ");
 312   walker.report_statistics(out);
 313 }
 314 


  30 #include "services/memTracker.hpp"
  31 #include "utilities/defaultStream.hpp"
  32 
  33 #ifdef SOLARIS
  34   volatile bool NMT_stack_walkable = false;
  35 #else
  36   volatile bool NMT_stack_walkable = true;
  37 #endif
  38 
  39 volatile NMT_TrackingLevel MemTracker::_tracking_level = NMT_unknown;
  40 NMT_TrackingLevel MemTracker::_cmdline_tracking_level = NMT_unknown;
  41 
  42 MemBaseline MemTracker::_baseline;
  43 Mutex*      MemTracker::_query_lock = NULL;
  44 bool MemTracker::_is_nmt_env_valid = true;
  45 
  46 
  47 NMT_TrackingLevel MemTracker::init_tracking_level() {
  48   NMT_TrackingLevel level = NMT_off;
  49   char buf[64];

  50   jio_snprintf(buf, sizeof(buf), "NMT_LEVEL_%d", os::current_process_id());
  51   const char *nmt_option = ::getenv(buf);
  52   if (nmt_option != NULL) {
  53     if (strcmp(nmt_option, "summary") == 0) {
  54       level = NMT_summary;
  55     } else if (strcmp(nmt_option, "detail") == 0) {
  56       level = NMT_detail;
  57     } else if (strcmp(nmt_option, "off") != 0) {
  58       // The option value is invalid
  59       _is_nmt_env_valid = false;
  60     }
  61 
  62     // Remove the environment variable to avoid leaking to child processes
  63     os::unsetenv(buf);
  64   }
  65 
  66   // Construct NativeCallStack::EMPTY_STACK. It may get constructed twice,
  67   // but it is benign, the results are the same.
  68   ::new ((void*)&NativeCallStack::EMPTY_STACK) NativeCallStack(0, false);
  69 
  70   if (!MallocTracker::initialize(level) ||
  71       !VirtualMemoryTracker::initialize(level)) {
  72     level = NMT_off;


 294       _bucket_over_threshold ++;
 295     }
 296     _longest_bucket_length = MAX2(_longest_bucket_length, length);
 297   }
 298 };
 299 
 300 
 301 void MemTracker::tuning_statistics(outputStream* out) {
 302   // NMT statistics
 303   StatisticsWalker walker;
 304   MallocSiteTable::walk_malloc_site(&walker);
 305   walker.completed();
 306 
 307   out->print_cr("Native Memory Tracking Statistics:");
 308   out->print_cr("Malloc allocation site table size: %d", MallocSiteTable::hash_buckets());
 309   out->print_cr("             Tracking stack depth: %d", NMT_TrackingStackDepth);
 310   NOT_PRODUCT(out->print_cr("Peak concurrent access: %d", MallocSiteTable::access_peak_count());)
 311   out->print_cr(" ");
 312   walker.report_statistics(out);
 313 }

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